Photorespiration

Q.

Which of the following is the key intermediate compound linking glycolysis to the Krebs cycle?

1. NADH

2. Malic acid

3. ATP

4. Acetyl CoA

Q.

The first stable product in C4 plant is

1. Oxaloacetic acid

2. Phosphoenol pyruvate

3. Ribulose 1, 5 diphosphate

4. Malic acid

Q.

The amino acids produced during the Glycolate pathway of photorespiration are

1. Serine and glycine

2. Glycine and tryptophan

3. Serine and tryptophan

4. Glycine and alanine

Q.

Which of the following is an endergonic process?

1. None of the above

2. Metabolism

3. Catabolism

4. Anabolism

Q.

Oxidative phosphorylation involves simultaneous oxidation and phosphorylation to finally form

1. ATP

2. Pyruvate

3. NADP

4. DPN

Q.

Which of the following is not correct about the Krebs cycle?

1. It starts with a six-carbon compound.

2. It occurs in mitochondria.

3. The intermediate compound which links glycolysis with the Krebs cycle is malic acid.

4. It is also called the citric acid cycle.

Q. Photorespiration is a wasteful process because

1. no synthesis of sugar takes place
2. no ATP production takes place
3. CO${}_2$ is released using ATP
4. all of the above

Q. Photosynthesis in C4-plants is relatively less limited by atmospheric CO₂ levels because

1. Effective pumping of CO₂ in to bundle sheath cells.
2. RuBisCO in C4 -plants has higher affinity for CO₂.
3. Four carbon acids are the primary initial CO₂ fixation products.
4. The primary fixation of CO₂ is mediated via PEP carboxylase.

Q.

Rubisco:

1. catalyzes the carboxylation of CO2 to ribulose 1, 5-bisphosphate

2. initiates photorespiration when the CO2/O2 ratio is low.

3. catalyzes the reduction of two molecules of PGAL to form glucose.

4. a and b but not c

Q.

How many times does the Krebs cycle turn per glucose molecule

1. once

2. twice

3. three times

4. four times

Q. RuBisco has active site that can bind carbon dioxide and __

Q. The energy wastage occurs during:

1. Dark reaction
2. Photorespiration
3. Glycolysis
4. Photosynthesis

Q. The first reaction in photorespiration is _____.

1. Carboxylation
2. Decarboxylation
3. Oxygenation
4. Phosphorylation

Q. Rate of photosynthesis increases as the oxygen concentration increases.

1. True
2. False

Q. How many molecules of ATP and NADPH are synthesized in a photorespiratory pathway?

1. 18 ATP and 12 NADPH
2. 39 ATP and 12 NADPH
3. 30 ATP and 12 NADPH
4. No ATP or NADPH

Q. Binding of oxygen to the reaction centre of RuBisCO leads to .

1. photophosphorylation
2. photorespiration
3. carboxylation
4. reduction

Q. Name the process of utilization of Acetyl CoA during respiration and who is the final acceptor of electrons in aerobic respiration.

Q. Respiration differs from photorespiration as the latter

1. takes place only during day and within the mitochondria only
2. yields less ATP
3. utilizes ATP
4. occurs in glyoxysomes

Q. Choose the correct statement(s) about photorespiration:
I. It occurs due to high oxygen concentration and low carbon dioxide condition
II. Warburg effect is a decrease in the rate of photosynthesis at high oxygen content
III. Peroxisome and mitochondria are not related to photorespiration
IV. It involves the oxidation of RuBP

1. I and III
2. I and II only
3. I, II and IV only
4. III and IV